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17.1 Defining Baseline
You need to define the base line before setting out straight line. You can define a baseline by inputting two points’
coordinates. The scale factor value is the difference between the input coordinate and the observed coordinate.
·
When not observing first or second points, scale factor is set to “1”.
·
Defined baseline can be used in both setting-out line measurement and point projection.
Procedure
Key
Screen display
（
1
）
Under the measurement mode, define the
function of LINE into the soft Key
See 20“key
function
allocation”
Meas. PC -30
PPM 0
S 4.583m
ZA 92 36’ 25”
HAR 30 25’ 18”
PROJ LINE HSET EDM
（
2
）
Select
LINE
LINE
Set-out line
1 Stn data
2 back sight data
3 define baseline
4 point
5 line
